The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 22, 1986
Filed:
Mar. 18, 1985
Ronald E Pringle, Houston, TX (US);
William D Eatwell, Houston, TX (US);
Camco, Incorporated, Houston, TX (US);
Abstract
A subsurface well safety valve having a housing with a valve closure member which is controlled by a flow tube which includes an improved hydraulic actuating mechanism. The housing includes a cylinder with a straight portion and a curved portion which is adapted to receive hydraulic fluid from the surface and a piston is movable in the cylinder and connected to the flow tube for moving the flow tube to an open position. The piston includes a metal seal and a flexible portion connected to the top of the metal seal and the flexible portion is adapted to move through the curved portion of the cylinder. A valve and a valve seat are provided in the cylinder above the piston for sealing the hydraulic fluid from the well surface when the valve is open and for engaging and holding the flexible portion and the piston in the open position.